The Macrobrachium dayanum, a locally available freshwater prawn of Jammu was sampled regularly
for a period of one year to analyze the seasonal variation in the lipid contents of muscles, hepatopancreas and
ovary. Remarkable variation in the lipid content in different tissues of M. dayanum has been analyzed during
the study period. Changes in the lipid content in all the three tissues were observed to be statistically significant
(p<0.05). Lipids in muscles corresponds to 0.23±0.11 and 3.83±0.11%, minimum and maximum value in the
month of September and December respectively. In hepatopancreas minimum of 5.05±0.21% in August and
maximum of 9.31±0.41% in February have been observed. Mean value of lipid content in the ovaries range
from 6.14±0.24% (minima) to 9.76±0.80% (maxima) in July and April respectively. Moreover, maximum
numbers of stage IV oocytes are observed in the ovary in the months of March-April and August to October
accompanied with increase in the lipid content during these respective months.